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Re: [Raspberry_Pi_4-Ham_RADIO] APRS and the PI (2)

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  • Ray Wells
    Kristoff, There s some great command line tools (sed, head, tail, etc) available to extract just the information fields you need from those beacons and pipe
    Message 1 of 27 , Jul 19, 2013
      Kristoff,

      There's some great command line tools (sed, head, tail, etc) available to extract just the information fields you need from those beacons and pipe the result through festival.

      Your project has given me an idea. I have a script that's a combination of shell commands and Perl that downloads the html weather page from the local airport as a text file, with lynx. I then use egrep, head, sed and cut to extract the fields I want from the first line (latest data) of wx data. Perl handles the mathematics to convert metric data to the aprs format. The various data is then assembled into an aprs wx beacon format for sending to xastir or dixprs for broadcast. Some of that data would be suitable for broadcasting on a voice channel, along the lines you mention. Mmmm, just what I need, another project <grin>

      Ray vk2tv



      On 20/07/13 06:31, Kristoff Bonne wrote:
       

      Hi Ray,



      What I had in mind was to generate APRS messages using some tool; but your message did get me thinking. As you mention festival (a text-to-speech tool), why not use a Pi to create a sort of bridge between APRS and normal FM radio?


      Using a radio (or the 20 dollar "RTL" DAB/DVB-T stick) we can monitor the local APRS frequencies and decode it with multimon-ng.


      Then, use certain information as received in APRS to trigger the broadcast of a spoken message in FM (on a local FM frequency or on the local repeater).

      A possible application would be to monitor the information from a local WX-station and send out a "warning: low-temperature alert, possible ice on roads" warning if needed.

      Another idea is something I noticed yesterday when looking at the log-files of all APRS messages I received:
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 00:44:48
      DX de    ON0ABT>430512.5  ON0BT-10     110 dg frm    ON0ABT            81km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 01:04:48
      DX de    ON0ABT>430512.5  ON0BT-10     110 dg frm    ON0ABT            81km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 01:24:48
      DX de    ON0ABT>430512.5  ON0BT-10     110 dg frm    ON0ABT            81km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 01:27:11
      DX de    ON0ABT>430512.5  PI1RWK       033 dg frm    ON0ABT           123km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 01:47:17
      DX de    ON0ABT>430512.5  PI1RWK       033 dg frm    ON0ABT           123km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 02:27:15
      DX de    ON0ABT>430512.5  PI1RWK       033 dg frm    ON0ABT           123km
      aprs: fm ON0ABT to DX via WIDE2-2 ctl UIv pid=F0(Text) len 76 02:39:08
      
      

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